Ruins of Tower Bridge + .PSD

In case you are interested on knowing how I created this image, you can download the .PSD in small resolution to know my step by steps. (Please do not post this image in any other place and claim it as your own. I only provide the .psd for those of you that want to know the whole process I used and learn something from it) (.PSD = leaning the basics about lighting and using gradient colors on the overall image + textures and how they work)